linux-kernel - arch/sparc/include/asm/irqflags_64.h:60:27: sparse: sparse: context imbalance in 'kfree_call_rcu'

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Message-ID: <202006020541.Vt3JhJCY%lkp@intel.com>
Date:   Tue, 2 Jun 2020 05:40:51 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Byungchul, Park," <byungchul.park@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: arch/sparc/include/asm/irqflags_64.h:60:27: sparse: sparse: context
 imbalance in 'kfree_call_rcu' - different lock contexts for basic block

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9bf9511e3d9f328c03f6f79bfb741c3d18f2f2c0
commit: a35d16905efc6ad5523d864a5c6efcb1e657e386 rcu: Add basic support for kfree_rcu() batching
date:   4 months ago
config: sparc-randconfig-s031-20200602 (attached as .config)
compiler: sparc64-linux-gcc (GCC) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-243-gc100a7ab-dirty
        git checkout a35d16905efc6ad5523d864a5c6efcb1e657e386
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=sparc CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

   kernel/rcu/tree.c:1152:13: sparse: sparse: context imbalance in 'rcu_start_this_gp' - different lock contexts for basic block
   kernel/rcu/tree.c:1565:9: sparse: sparse: context imbalance in 'rcu_gp_init' - different lock contexts for basic block
   kernel/rcu/tree.c:2292:9: sparse: sparse: context imbalance in 'force_qs_rnp' - different lock contexts for basic block
   kernel/rcu/tree.c:2348:25: sparse: sparse: context imbalance in 'rcu_force_quiescent_state' - unexpected unlock
>> arch/sparc/include/asm/irqflags_64.h:60:27: sparse: sparse: context imbalance in 'kfree_call_rcu' - different lock contexts for basic block
   kernel/rcu/tree_exp.h:193:9: sparse: sparse: context imbalance in '__rcu_report_exp_rnp' - different lock contexts for basic block

vim +/kfree_call_rcu +60 arch/sparc/include/asm/irqflags_64.h

f5e706ad886b6a include/asm-sparc/irqflags_64.h      Sam Ravnborg   2008-07-17  59  
18d85bc558edfa arch/sparc/include/asm/irqflags_64.h Steven Rostedt 2011-07-06 @60  static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
f5e706ad886b6a include/asm-sparc/irqflags_64.h      Sam Ravnborg   2008-07-17  61  {
f5e706ad886b6a include/asm-sparc/irqflags_64.h      Sam Ravnborg   2008-07-17  62  	return (flags > 0);
f5e706ad886b6a include/asm-sparc/irqflags_64.h      Sam Ravnborg   2008-07-17  63  }
f5e706ad886b6a include/asm-sparc/irqflags_64.h      Sam Ravnborg   2008-07-17  64  

:::::: The code at line 60 was first introduced by commit
:::::: 18d85bc558edfa5de7f5b49b6a25fbfdc42628e0 sparc/irqs: Do not trace arch_local_{*,irq_*} functions

:::::: TO: Steven Rostedt <rostedt@...dmis.org>
:::::: CC: David S. Miller <davem@...emloft.net>

---
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